Wow so lots to consider. I have a air pump at home. I actually don't need one at work cause right across the street there is a gas station with FREE air. I'm considering the cartridge...might be my best bet as I got a flat at 5 am in the morning(still dark out). While waiting for my co workers to pick me up lots of people passing by. EERR a little unnerving. I'll check out the ones you guys suggested. Thanks!!